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Definition of Cv Valve:
The valve Cv is the flow rate (in US gal/min) of pure water at 60 o F passing
through the valve when the valve disc is fully opened and the pressure differential
between the tow ends of the valve is 1Lbf/in 2.
Cv=V 〔 G/ ( P 1 -P 2 ) 〕 1/2
V--- Max. flow (in US gal/min)
P1 --- inlet side pressure (1Lbf/in 2)
P2 --- Outlet side pressure (1Lbf/in 2)
G--- Specific gravity (1 for water)
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